You're displaying some of that past kingdom thinking. The future involves building in factories where units can be built efficiently, cheaply, and with high tolerances. Yes, these manufactured pieces will be assembled quickly, but don't forget they took significant effort to build before this assembly begins.

You may long for a pre-Model-T car because of the handcrafted beauty, but I doubt you can afford to commute in one. China is trying to build affordable housing for a massive number of people. That's can't be done in wood-fired brick with carved stone gargoyles.